Harness motion for looms



Nov. 8, 1927. R. J. BARTHOLOMEW HARNESS MOTION FOR LOOMS Filed Sept. 24.1925 2 Sheets-Sheet l INVENTOR mg m ATTORNEYS Nov. 8, 1927. r 1548,01

R. J. BARTHOLOMEW HARNESS MOTION FOR LOOMS Tiled Sept. 24, 1925 2Sheets-Sheet 2 v INVENTOR BY ma M /W- A'ITORNEYB,

Patented Nov. 8, 1927.

UNITED sres ROBERT J. BARTHOLOMEVI, OF LANSIJALE, PENNSYLVANIA, ASSIGNORTO FLETCHER XVORKS, INCORPORATED, OF PHILADELPHIA,

PENNSYLVANIA.

than

nannnss vrorron non Looms.

Application filed September 24, 1925. Serial No. 58,234.

My invention relates to an improvement in looms, being particularlydirected to an improved harness motion therefor.

One of the objects of my invention is the provision of a harness motionso constituted and arranged. as to greatly simplify the changing of theoperation of the harness for the weaving of diil'erent designs offabrics. v

Another object of my invention is the pro vision of a harness motion inwhich the sclective element thereof drives the cam which operates theharness directly as distinguished from merely setting certain mechanismin position whereby the harness will be operated.

A still further object of my-invention 15 the provision of an improvedlocking mechanism for each cam so constructed that each cam is held inlocked position until the instant the cam is to be advanced.

A still further object of my invention is the provision of an improvedharness motion for looms wherein each cam constituting a part thereofhas its individual drive, as distinguished from the cams being fastenedto each other and driven as a unit, and wherein the driving mechanismfor the cams may be readily changed to effect a change in the harnessmotion.

In order that my invention may be clearly understood, I may state thatthe motions which my selective harness motion is designed to replaceconsist of a plurality of cams bolted together and all rotating togetheras a unit, and other harness motions known to the trade, such as dobby,side jacquard machine and geared head motion, etc. Assuming that in sucha motion the harness is changed for each pick, one up one down, one upone down, etc, to change such a motion to two up two down, two uptwodown, etc, for example, would necessitate the sub-- stitution ofentirely different cams, and to change this motion to seven up one down,for example, would necessitate the substitution of still another cam.

By my improved arrangement, however, in which each cam is drivenindependently by a driving chain of improved construction, to change theharness motion requires will not be described further in detail.

Each ack carries a roller 3, riding in a cam track l provided in theface of each cam 5. The cams .5 are mounted for independent rotation ona shaft 6 carried in bearings 7. The periphery of each cam is providedwith teeth 8.

Mounted in any convenient location adjacent the cams 5 is a shaft 9vcarrying idler sprockets 10, the number of idler sprockets dependingupon the number of cams, there being a sprocket to correspond toeachcam. Disposed below the idler shaft 9 is a shaft 11 on which aremounted a series of drive sprockets 12, corresponding in numher to theidler sprockets 10. Adjacent one end of the shaft 11 is a bevel gear 13,in mesh constantly with a bevelled gear 14 carried atone end Of'tllQ-drive shaft 15.

Carried by each pair of idler sprockets 10 and drive sprockets 12 is asprocket chain '16, provided at intervals as will be pointed out laterin more detail, with laterally eX- tending teeth 17 adapted at the,proper time .to engage with the teeth 8 in the cams to cause the cams tobe rotated independently and selectively for a distance dependinguponthe motion desired;

Extending across the loom just above the peripheries of the cams 5 is ashaft 18 carrying a series of locking devices or pawls 19 pivotedthereon, the end 20 of each pawl engaging the teeth 8 on the peripheryof each cam, as shown in Fig. 1, to hold the cam against movement, whilethe other end 21 of PENNSYLVANIA, A CORPORATION OF I driving chains.

these pawls offset to the left with respect to the chains 16, as shownin Fig. :2 is adapted to be engaged by the driving teeth 17 at theproper instant to lift the pawl out of locking position to free thecams.

The operation of my. improved structure is extremely simple. As thedrive shaft 15 is rotated the drive gears 12 will be driven to drive thesprocket chains 16. As each chain reaches a position where the teeth 17carried thereby are about to engage the teeth 8 on the face of each cam,the teeth will first of all engage the inner end 21 of each locking pawl19 gradually lifting the same out of the locking position of Fig. 1 tothe unlocked position of Fig. 3, at which time the first tooth 17 of thechains will engage a tooth 8 of the cams to thereafter cause the cam tobe rotated for a distance depending upon the number of driving teeth onthe chain, which in turn will depend upon the motion to be imparted tothe harness. The cams as illustrated are eight time cams, that is to sayeach cam makes one complete revolution in eight picks of the loom. Thesepar ticular cams illustrated happen to change the harness for each pick,one up one down, one up one down, and so on. Any combination desired,however, may be obtained by merely changing the number or location orboth of the driving teeth 17 carried by the This is of course a greatadvantage over the usual cam motion in which the cams are boltedtogether and rotate as a unit, as distinguished from my structure inwhich each cam is rotated or driven individually. In my selectiveharness motion if one harness is to stay up for seven picks for example,the cam controlling this harness will be locked in stationary positionautomatically with the cam roller on the high point for seven picks andwill then be turned on the next pick so that the harness is dropped, andwill then be turned again for the following pick so that the harness israised, in which position it will remain for the next six picks.

It will be seen therefore from the foregoing that I have provided animproved harness motion for looms in which the selective element of themotion drives the cams direct, and in which any combination of harnessmotions may be easily obtained.

I have not stressed the particular con- 'struction of driving chainemployed, inas- It is to be understood also that the construction of thelocking mechanism as well as the other parts of my structure, may bevaried from that illustrated without departing from the spirit and scopeof the invention.

lVhat I claim is 1. In a harness motion for looms, a plurality of cams,driving mechanism for each cam, said driving mechanism being operableduring a part of its travel to intermittently drive the cam, and meanscontrolled by each of said driving mechanisms for effecting in dividualand automatic prcdetcrn'iincd locking of the cams throughout the idletravel of the driving mechanism.

2. In a harness motion for looms, a plurality of cams. an individualselective drive operable throughout part of its motion to drive eachcam, and cam locking mechanism for each cam, and individually controlleda plurality of individually rotatable cams carried by said shaft, asprocket drive chain ing mechanism.

3. In a harness motion for looms, a shaft, a plurality of individuallyrotatable cams carried by said shaft, a sprocket drive chain for eachcam, adjustable teeth carried by each chain for effecting individual andselective drive of each cam throughout a part of the travel of thechain, and a locking pawl for each cam individually controlled by thedriving teeth of each chain to lock the cam against motion throughoutthe remaining travel of the chain.

1. In a harness motion for looms, a shaft, a plurality of individualrotatable cams carried by said shaft, a shaft adjacent the faces of saidcams, a sprocket fixed to said shaft, a drive shaft for driving saidsprocket, a plurality of idler sprockets, a drive chain for each camcarried by said idler sprockets and driven by the sprocket firstn'ientioncd. sets of drive teeth projecting from each of said chains,said teeth being mounted for adjustment in said chains, gear teeth onthe peripheriesof said cams and adapted to be engaged at predeterminedintervals by said drive teeth, and a locking pawl for each of said camscontrolled by said drive teeth for locking said cams.

5. In a harness motion for looms, jacks, cams for individually anddirectly driving said jacks, and directly connected thereto, andselective elements for driving each cam whereby the harness is directlyoperated.

This specification signed this 22d day of September, 1925.

ROBERT J. BARTHOLOMEIV.

